AC Maintenance PCSA 2023 AC Check Up Free w/ Install Customer has been noticing a musty smell when unit first starts up. Switched thermostat fan mode from auto to circulate to see if that help prevents the smell. If not evapfresh maybe needed in the future. Flushed drain lines. Cleaned outdoor coil. Puron levels are within range. Checked wire connections. Replaced filter. Everything was clean and checked out well. System is operating normally at this time.